External wall insulation in Cardiff
Planning external wall insulation in Cardiff? The answers below cover cost, timescales and the rules that apply in Wales; the free survey turns them into a fixed price for your house.
Homes in and around Cardiff
Cardiff is in the CF10 postcode district. 6 other towns we cover are within 25 miles.
Nearby places we cover from Cardiff include Penarth (3 miles), Caerphilly (7 miles) and Barry (7 miles), all in Wales.
Your quote will name the certified system, the board thickness and the calculated U-value for your walls, not a vague 'insulation package'.
Nearby towns we cover: Penarth (3 miles), Caerphilly (7 miles), Barry (7 miles), Risca (9 miles), Newport, Gwent (11 miles), Pontypridd (11 miles).
External wall insulation prices in Cardiff
Guide prices for external wall insulation in Cardiff run from about £109 to £175 per square metre installed, depending on system and finish; scaffolding priced per house, with VAT at 0% on homes until 31 March 2027.
What moves the price most is the board and finish you choose, the access around the house, and details such as roofline extensions or moving a gas meter.
Popular services in Cardiff
- EPS insulated render
- Brick slip EWI
- Insulated cladding
- Insulating lime render
- Non-traditional houses
- Bungalow EWI
- Terraced house EWI
- Semi-detached EWI
- Park home insulation
- Failed EWI remediation
- All 24 services
Rules that apply in Cardiff
- Building regulations
- Wales has its own Building Regulations and Approved Document L. Renovating a large part of an external wall brings the energy standards into play, so building control approval is needed for EWI.
- VAT
- Installing insulation in a home is zero-rated for VAT until 31 March 2027, then 5%.
Checked October 2026. Rules change, so we confirm them for your address at survey.
External wall insulation in Cardiff: questions
How much should I budget for external wall insulation in Cardiff?
Budget around £109–£175 per square metre of wall for the system and finish, plus scaffolding priced per house. The survey measures your walls in Cardiff and fixes the total in writing.
Do you cover Penarth as well as Cardiff?
Yes. From Cardiff we also cover Penarth, Caerphilly and Barry, and the rest of South Glamorgan.
How long will the work take in Cardiff?
Two to six weeks on site for most houses, depending on size: bungalows are quicker, detached houses longer, weather allowing. Render isn't applied in rain or frost.